G2 Gas Technician Module 23 Revised
Exam 2026 Questions and Answers
Why are air cleaners installed ahead of heating or cooling coils and air
conditioners? - Correct Answer -To protect the equipment from dust and increase
efficiency
What are two ways in which a mechanical filter could restrict air flow? - Correct
Answer -Dirty Air Filter and Incorrect Air Filter
Name three types of air cleaners that can be used with a forced-air furnace? -
Correct Answer -Media, electrostatic, and electronic
Which type of air cleaner is usually the least expensive? - Correct Answer -
Media/Mechanical
Which type of air cleaner is usually the most expensive? - Correct Answer -
Electronic (EAC)
Name two advantages of an electronic air cleaner? - Correct Answer -Highly
Efficiency and Collects Particles
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, Do electronic air cleaners remove smoke odours from the conditioned air? -
Correct Answer -No
How can smoke odours be reduced? - Correct Answer -Activated Carbon Filter/
Coal Filter
What must the gas technician do before installing any air cleaner? - Correct
Answer -Comply with Manufacturers Instructions
If there are arrows on a filter frame, which way must they face? - Correct Answer -
Same way as the systems air flow
Why must be done before opening the blower door on a forced-air furnace? -
Correct Answer -Disconnect Power
How frequently should furnace filter be inspected in the heating season? - Correct
Answer -Every Month
How frequently should filters be replaced? - Correct Answer -Whenever they need
to be.
Why can disposable filters not be re-used? - Correct Answer -Removal of mineral
oils will cause the filter to not operate
Name three problems that can result from operating a forced-air furnace without a
filter? - Correct Answer -Dust and lint buildup, Inefficiency and Fire
©COPYRIGHT 2025 ALL RIGHTS RESERVED 2
Exam 2026 Questions and Answers
Why are air cleaners installed ahead of heating or cooling coils and air
conditioners? - Correct Answer -To protect the equipment from dust and increase
efficiency
What are two ways in which a mechanical filter could restrict air flow? - Correct
Answer -Dirty Air Filter and Incorrect Air Filter
Name three types of air cleaners that can be used with a forced-air furnace? -
Correct Answer -Media, electrostatic, and electronic
Which type of air cleaner is usually the least expensive? - Correct Answer -
Media/Mechanical
Which type of air cleaner is usually the most expensive? - Correct Answer -
Electronic (EAC)
Name two advantages of an electronic air cleaner? - Correct Answer -Highly
Efficiency and Collects Particles
©COPYRIGHT 2025 ALL RIGHTS RESERVED 1
, Do electronic air cleaners remove smoke odours from the conditioned air? -
Correct Answer -No
How can smoke odours be reduced? - Correct Answer -Activated Carbon Filter/
Coal Filter
What must the gas technician do before installing any air cleaner? - Correct
Answer -Comply with Manufacturers Instructions
If there are arrows on a filter frame, which way must they face? - Correct Answer -
Same way as the systems air flow
Why must be done before opening the blower door on a forced-air furnace? -
Correct Answer -Disconnect Power
How frequently should furnace filter be inspected in the heating season? - Correct
Answer -Every Month
How frequently should filters be replaced? - Correct Answer -Whenever they need
to be.
Why can disposable filters not be re-used? - Correct Answer -Removal of mineral
oils will cause the filter to not operate
Name three problems that can result from operating a forced-air furnace without a
filter? - Correct Answer -Dust and lint buildup, Inefficiency and Fire
©COPYRIGHT 2025 ALL RIGHTS RESERVED 2
